1 //===-- asan_suppressions.cpp ---------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file is a part of AddressSanitizer, an address sanity checker. 10 // 11 // Issue suppression and suppression-related functions. 12 //===----------------------------------------------------------------------===// 13 14 #include "asan_suppressions.h" 15 16 #include "asan_stack.h" 17 #include "sanitizer_common/sanitizer_placement_new.h" 18 #include "sanitizer_common/sanitizer_suppressions.h" 19 #include "sanitizer_common/sanitizer_symbolizer.h" 20 21 namespace __asan { 22 23 ALIGNED(64) static char suppression_placeholder[sizeof(SuppressionContext)]; 24 static SuppressionContext *suppression_ctx = nullptr; 25 static const char kInterceptorName[] = "interceptor_name"; 26 static const char kInterceptorViaFunction[] = "interceptor_via_fun"; 27 static const char kInterceptorViaLibrary[] = "interceptor_via_lib"; 28 static const char kODRViolation[] = "odr_violation"; 29 static const char *kSuppressionTypes[] = { 30 kInterceptorName, kInterceptorViaFunction, kInterceptorViaLibrary, 31 kODRViolation}; 32 33 SANITIZER_INTERFACE_WEAK_DEF(const char *, __asan_default_suppressions, void) { 34 return ""; 35 } 36 37 void InitializeSuppressions() { 38 CHECK_EQ(nullptr, suppression_ctx); 39 suppression_ctx = new (suppression_placeholder) 40 SuppressionContext(kSuppressionTypes, ARRAY_SIZE(kSuppressionTypes)); 41 suppression_ctx->ParseFromFile(flags()->suppressions); 42 if (&__asan_default_suppressions) 43 suppression_ctx->Parse(__asan_default_suppressions()); 44 } 45 46 bool IsInterceptorSuppressed(const char *interceptor_name) { 47 CHECK(suppression_ctx); 48 Suppression *s; 49 // Match "interceptor_name" suppressions. 50 return suppression_ctx->Match(interceptor_name, kInterceptorName, &s); 51 } 52 53 bool HaveStackTraceBasedSuppressions() { 54 CHECK(suppression_ctx); 55 return suppression_ctx->HasSuppressionType(kInterceptorViaFunction) || 56 suppression_ctx->HasSuppressionType(kInterceptorViaLibrary); 57 } 58 59 bool IsODRViolationSuppressed(const char *global_var_name) { 60 CHECK(suppression_ctx); 61 Suppression *s; 62 // Match "odr_violation" suppressions. 63 return suppression_ctx->Match(global_var_name, kODRViolation, &s); 64 } 65 66 bool IsStackTraceSuppressed(const StackTrace *stack) { 67 if (!HaveStackTraceBasedSuppressions()) 68 return false; 69 70 CHECK(suppression_ctx); 71 Symbolizer *symbolizer = Symbolizer::GetOrInit(); 72 Suppression *s; 73 for (uptr i = 0; i < stack->size && stack->trace[i]; i++) { 74 uptr addr = stack->trace[i]; 75 76 if (suppression_ctx->HasSuppressionType(kInterceptorViaLibrary)) { 77 // Match "interceptor_via_lib" suppressions. 78 if (const char *module_name = symbolizer->GetModuleNameForPc(addr)) 79 if (suppression_ctx->Match(module_name, kInterceptorViaLibrary, &s)) 80 return true; 81 } 82 83 if (suppression_ctx->HasSuppressionType(kInterceptorViaFunction)) { 84 SymbolizedStack *frames = symbolizer->SymbolizePC(addr); 85 CHECK(frames); 86 for (SymbolizedStack *cur = frames; cur; cur = cur->next) { 87 const char *function_name = cur->info.function; 88 if (!function_name) { 89 continue; 90 } 91 // Match "interceptor_via_fun" suppressions. 92 if (suppression_ctx->Match(function_name, kInterceptorViaFunction, 93 &s)) { 94 frames->ClearAll(); 95 return true; 96 } 97 } 98 frames->ClearAll(); 99 } 100 } 101 return false; 102 } 103 104 } // namespace __asan 105